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1 <br />J <br />C <br />7 <br />1 <br />A disadvantage of the grinder pump system, when compared to the <br />conventional gravity sewer collection system, is that the grinder pump will <br />cause an increase in the homeowner's electrical bill due to the <br />intermittent operation of its 2 HP, single phase motor. Assuming the <br />average dwelling unit discharges approximately 300 GPD of wastewater into <br />the system, it is estimated that the 2 HP, single phase pump motor will <br />cycle approximately 6 times and pump a total of 15 minutes out of every 24 <br />hours. Using an estimated electric charge of 8 cents per kilowatt hour, <br />s <br />and assuming 2 HP is equal to two kilowatts, the estimated increase in <br />electrical cost per dwelling unit for 15 minutes of pump operation per day <br />is 4¢ per day, or $1.20 per month. <br />An estimated construction cost for the grinder pump/manifolded small force <br />main alternative is included in the following section of this Report. <br />8.3 TIME SCHEDULE <br />The time schedule for constructing a sewer system in the study area will be <br />subject to the availability of grant assistance. The EPA divides its <br />program into three steps as follows: <br />STEP I PLANNING <br />STEP II DESIGN <br />STEP III CONSTRUCTION <br />Table 8-1 presents an estimated schedule for completion of the project <br />without considering the time involved for receiving grant funds. <br />8.4 COST ESTIMATE <br />8.4.1 CONSTRUCTION COSTS <br />A cost estimate was conducted for constructing the recommended wastewater <br />collection system. This estimate was performed using EPA guidelines. <br />IRC.VB4 <br />6/4/87 <br />E:M <br />